By invoking the print command on specially manipulated iframes, it forces the browser to overload or confuse security extensions, forcing them to stop functioning.
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Since you asked for a "solid guide," and extprint3r is likely a creator of such guides, I have compiled a that covers the fundamentals usually discussed by creators in this space.
: It is often distributed as part of "Ext Remover" projects—open-source archives that consolidate various Chrome OS exploits like LTBEEF to help users bypass administrative restrictions on Chromebooks. GitHub - killsecurly/blobbyboi-extprint3r extprint3r
As of late 2025, Google has patched the specific vulnerability enabling ExtPrint3r in ChromeOS versions beyond 134. However, the underlying technique of using print operations to manipulate extension processes may resurface in future variants, particularly if new patches inadvertently reintroduce similar conditions.
Developed by a user known as , ExtPrint3r is an exploitation tool designed to bypass, disable, or "kill" extensions on managed ChromeOS devices. As the successor to the earlier ExtHang3r , this tool has posed significant challenges to school-issued device management. What is ExtPrint3r?
| | Value | |---|---| | CVE ID | CVE-2025-6179 | | Published | June 16, 2025 | | CVSS v3 Score | 9.8 (Critical) | | Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | | Weakness Type | CWE-276 (Incorrect Default Permissions) | By invoking the print command on specially manipulated
Modern printers store recent documents on internal hard drives; a tool like Extprint3r can be used to retrieve sensitive data from these caches.
ExtPrint3r is a browser-based exploit designed for that allows users to disable or "freeze" managed extensions by overwhelming the browser's printing and rendering processes. It was developed as a more consistent and long-lasting successor to previous methods like Core Mechanism
ExtPrint3r allows users to enable Developer Mode, bypassing standard management policies. If you share with third parties, their policies apply
For enterprise teams developing custom internal browser extensions, minimizing the attack surface prevents these exploits from finding a valid target vector.
is an open-source exploit hosted on platforms like GitHub, designed to disrupt the operation of web extensions in ChromeOS. It falls under the umbrella of student-driven, "unblocker" tools used to bypass restrictions set by school administrators (such as Gogaurduan or Securly) on school-issued laptops.